Pmnooralt



G. PAWSON.

TURNING TOOL. APPLICATION FILED MAY 21. 191B.

Patented Sept. 30, 1919.

GILBERT PAWSON, OF KENSINGTON GORE, LONDON, ENGLAND.

TURNING-TOOL.

tartan.

Specification of Letters Patent. Patented Sept. 1919.

Application filed May 27, 1918. Serial No. 236,898.

To all whom it may concern:

Be it known that I, GILBERT PAWSON, a subject of the King of Great Britain, residing at Queens Gate WVorks, Kensington Gore, London, England, have invented a new and useful Improved Turning-Tool, of which the following is a specification.

My invention relates to a. turning tool especially intended for the production from a rod or barof a series of uniform articles, the said tool consisting essentially in the combination with a tool-holder of one or more steadying supports which is or are so mounted with relation to the tool that it is impossible for any improper movement of one with relation to the other taking place, while at the same time'the combined toolholder and support are mounted in such a manner that they are capable of'movin'gin unison in case the bar from which the articles are being formed is not running true, whereby any malformation of the articles produced is avoided. I

In a suitable arrangement for carrying out my invention I mount two frames or members pivotally upon a common spindle, in one of which the cutter is mounted, while the other constitutes the work support, and in conjunction with these frames or members I provide means for drawing them together during the cutting operation.

My invention will be readily understood by reference to the accompanying drawing, in which Figure 1 is an end view of the improved tool,

Fig. 2 is a face view with certain parts removed; and,

Fig. 3 is a plan.

a, 6 indicate the work supporting member and the tool carrying member, respectively, of the tool and c the spindle upon which the same are pivoted, the said spindle being carried in supports (2, d fixed to a bed or plate 6 which may be the bed of an ordinary lathe. As shown in the drawing the member 6 is made in two sections which are arranged on the opposite sides of the member a, these two sections carrying in slots f at their upper end a cross-head g, the said cross-head, as shown, being provided with an enlarged portion in. To the free end of the member a is pivotally connected one end of a bolt 2', the other end of which is screwthreaded and passed through a hole or eye in the enlarged part h of the cross-head g,

tions of the member This cutter is of circular section and has its circumference shaped to correspond to the profile of the article to be turned, notch or recess 0 be- 7 ing formed longitudinally of the cutter, as shown in Fig. 1, to form the cutting edge 29., 9 indicates the'lip or ledge formed in the member a and upon which the bar A to be operated upon is supported during the turning operation, the position of the said lip or ledge being adapted to the diameter of the said bar, so thatth'e latter is pre sented' to the edge 79 of the cutter in the proper position. As the arts of the member or against which the ar ,A bears tend to wear away, they may be provided with renewablesurfaces or with anti-friction rollers.

In practicemy improvedtool is used in connection with a driving headstock having a hollow mandrel or spindle through which the bar A is passed. In the drawing a part of a chuck or clamp for gripping the bar is indicated at a".

In using the tool it will be understood that the bar A is moved through the mandrel and its end laid upon the lip q, whereupon it is gripped by the chuck 7- and the head-stock then started. As the bar A rotates the nut 71 is turned by means of the handle Z so that the said bar and the cutter m will be brought into contact. As the rotation of the nut 7:: is continued the cutter m is fed toward the work A until the desired profile has been attained. The outter m has combined with it a flange 8 forming a parting tool, which serves, as the said cutter is fed toward the bar A, to separate the portion thereof previously profiled. In the drawing this previously profiled part, is represented by the letter t, this part being, as before stated, severed from the bar as the adjacent part of the bar is being profiled.

A spring a is preferably arranged between the two frames or members a, b, for instance, around the bolt 71, for the purpose of separating the said frames when the tool is to be opened to allow the bar A to be fed forward. Stops may be provided for limiting the movement of the two frames with rela tion to one .anotheriin' order to arrest the cut at any desired point; or, if desired, the nut 70 may have a graduated ring upon it, arranged in conjunction with a pointer to,

, for allowing of rotating the saidnut to any desired extent. 7

Instead of drawing the two members of the tool together-by means of a screw, as

described, it is to'be understood that cams,

levers or other means may be used for the purpose; also, instead of mounting the two members on a common pivot they may be mounted on separate pivots provided such pivots are rigid with relation to one another.

Claims: V 1. In a turning tool the combination of two members mounted at one end upon a common spindle and at the other end connected by a bolt carrying a regulating nut, one ofthe said members being provided with V I a cutter while the other is formed with a lip or ledge forming a work support, whereby when the said nut is rotated the cutter will be fed toward the work, substantially as described.

2. In a turning tool, the combination of two members pivotally mounted'at one end upon a common support, and at the other end connected by means for drawing the copies of this patent may be :obtained for same together, one of said members being [provided with a cutter while the other is formed with a lip forming a work support,

whereby when the said connecting means is operated the cutter will be fed toward the 7 work. a V

3. In a turning. tool, a two-part member having one of its ends pivotally .mounted upon a vsupport, a cutting tool carried by said member, a work supporting member located between the two parts of the first member and having one of its ends pivotally mounted on sald support, and means connecting the free ends of said members and constructed to move one of said members ing the members toward each other.

5. A device of the kind described in claim 45ha vingi a spring surrounding the bolt and bearing against the rod for moving the free ends of the members aparta 6; A device of the kind described in claim 1, in which the regulating nut is provided with indications and a pointer located adjacent the indications and cooperating with the same to indicate relative movements of the members. I l

GILBERT PAWSON.

five cents each, by addressing the commis s ioner 'of Patents. Washington, D. G. 

